/*
 * Copyright 2004-2006, Thorbjørn Lindeijer <thorbjorn@lindeijer.nl>
 * Copyright 2004-2006, Adam Turk <aturk@biggeruniverse.com>
 *
 * This file is part of libtiled-java.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at
 * your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library;  If not, see <http://www.gnu.org/licenses/>.
 */

package tiled.util;

import android.graphics.Bitmap;

/**
 * Cuts tiles from a tileset image according to a regular rectangular pattern.
 * Supports a variable spacing between tiles and a margin around them.
 */
public class BasicTileCutter implements TileCutter {
	private int nextX, nextY;
	private Bitmap image;
	private final int tileWidth;
	private final int tileHeight;
	private final int tileSpacing;
	private final int tileMargin;

	public BasicTileCutter(int tileWidth, int tileHeight, int tileSpacing,
			int tileMargin) {
		this.tileWidth = tileWidth;
		this.tileHeight = tileHeight;
		this.tileSpacing = tileSpacing;
		this.tileMargin = tileMargin;

		reset();
	}

	public String getName() {
		return "Basic";
	}

	public void setImage(Bitmap image) {
		this.image = image;
	}

	public Bitmap getNextTile() {
		if (nextY + tileHeight + tileMargin <= image.getHeight()) {
			Bitmap tile = Bitmap.createBitmap(image, nextX, nextY, tileWidth,
					tileHeight);
			nextX += tileWidth + tileSpacing;

			if (nextX + tileWidth + tileMargin > image.getWidth()) {
				nextX = tileMargin;
				nextY += tileHeight + tileSpacing;
			}

			return tile;
		}

		return null;
	}

	public void reset() {
		nextX = tileMargin;
		nextY = tileMargin;
	}

	public Dimension getTileDimensions() {
		return new Dimension(tileWidth, tileHeight);
	}

	/**
	 * Returns the spacing between tile images.
	 * 
	 * @return the spacing between tile images.
	 */
	public int getTileSpacing() {
		return tileSpacing;
	}

	/**
	 * Returns the margin around the tile images.
	 * 
	 * @return the margin around the tile images.
	 */
	public int getTileMargin() {
		return tileMargin;
	}

	/**
	 * Returns the number of tiles per row in the tileset image.
	 * 
	 * @return the number of tiles per row in the tileset image.
	 */
	public int getTilesPerRow() {
		return (image.getWidth() - 2 * tileMargin + tileSpacing)
				/ (tileWidth + tileSpacing);
	}
}
